Maine election officials, including Democratic Deputy Secretary of State Julie Flynn, right, began counting ballots on Friday, Nov. 9, 2018, in Augusta for the Second Congressional District's House election. The election is the first congressional race in American history to be decided by the ranked-choice voting method that allows second choices. (AP Photo/Marina Villeneuve)

Nate Silver, a political handicapper and founder of the website FiveThirtyEight, tweeted early Thursday that the race still appears to favor McAdams. But Silver clarified later that the prospect of a Democratic win in the district had slipped from “likely” to a “lean.”

We're going to dial this back to "Lean D" from "Likely D". McAdams gained ground as some Salt Lake County ballots were reported, but his margins were not as wide as on Election Day and frankly it's not totally clear how much remaining vote is outstanding in which counties.

Despite the race not being finalized, McAdams was expected to be in Washington on Tuesday afternoon to participate in orientation meetings for new members of Congress. He was one of 10 freshmen — one Republican and nine Democrats — who are leading in currently undecided races.